/**
 * http://usejsdoc.org/
 * event emitter example
 */
//引入events模块
var events = require('events');
//创建eventEmitter对象
var eventEmitter = new events.EventEmitter();
//创建事件处理程序
var connectHandler = function connected(){
	console.log('连接成功。');
	//触发data_received事件
	eventEmitter.emit('data_received');
}
//绑定data_received事件处理程序
eventEmitter.on('connection',connectHandler);
//使用匿名函数绑定data_received事件
eventEmitter.on('data_received',function(){
	console.log('数据接收成功。');
});
//触发connection事件
eventEmitter.emit('connection');
console.log("程序执行完毕。")